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Abstract

This article describes a method for implementing a protocol to manage the exchange of graphical data in realtime within a multi-tasked environment. The Graphical Data Exchange (GDE) Protocol provides the capability for independent applications executing as separate processes to interchange arbitrary amount of data ranging from small acknowledgement message to huge amounts of descriptive graphics data in a consistent manner across both process and system boundaries.

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United States

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English (United States)

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Graphical Data Exchange Protocol

This article describes a method for implementing a protocol to manage the
exchange of graphical data in realtime within a multi-tasked environment. The
Graphical Data Exchange (GDE) Protocol provides the capability for independent
applications executing as separate processes to interchange arbitrary amount of
data ranging from small acknowledgement message to huge amounts of
descriptive graphics data in a consistent manner across both process and
system boundaries.

The Dynamic Data Exchange (DDE) protocol is an existing, defined protocol
in the Microsoft Windows environment for passing data dynamically between
applications. However, existing protocols such as DDE are unable to suitably
pass data between applications in a multi- tasking environment. Furthermore,
such protocols are generally inconsistent in their conventions. When an
application broadcasts a conversation initiation message in DDE, it identifies the
topic and target application by using global system memory hash tables (atoms).
However, in a multi-tasking environment, such as the IBM OS/2*, receiving
applications must know the handle to the atom table before they can look up the
atoms and hash the strings. This implies that an additional message must be
broadcast before DDE conversations are initiated, and ALL applications
participating in any DDE conversation must access the atom table and decode
the strings before determining if the message was intended for them. In DDE,
once the atom tab...